Foldable electronic device

ABSTRACT

A foldable electronic device includes a central body, a linkage unit, a plurality of operating mechanisms, and a plurality of panel bodies. The linkage unit includes a plurality of driving shafts. Each of the operating mechanism has a wing rod, a lifting plate, and a connecting rod. The wing rod is fixed to the lifting plate. The wing rod and the connecting rod pivotally connecting to the central body and the driving shaft respectively. When the panel bodies are in a folded status, a flexible screen is bent, and the wing rod, the lifting plate, and the central body collectively define a yielding space for accommodating a flexible section of the flexible section. The supporting plate at the bottom of the flexible screen has a weakening structure corresponding to the flexible section.

CROSS REFERENCE TO RELATED APPLICATION

This present application is a continuation-in-part of U.S. applicationSer. No. 17/837,425 filed on Jun. 10, 2022 and entitled “FOLDABLEELECTRONIC DEVICE”. The U.S. application Ser. No. 17/837,425 claims thebenefits of U.S. Provisional Application Ser. No. 63/211,777 filed onJun. 17, 2021, and the benefit of Taiwan Patent Application Serial No.111202403 filed on Mar. 10, 2022. The entirety of each Application isincorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a foldable electronic device,especially a foldable electronic device with a flexible screen.

2. Description of Related Art

Currently known foldable electronic devices such as those disclosed inTaiwan patent application TW M620175 omit the conventional hinge module,and use a plurality of four connecting rods combining other componentsto provide a yielding space for accommodating the flexible section. Indetail, when the conventional foldable electronic device is folded, thefirst lifting plate and the second lifting plate can be movedcorrespondingly through the four connecting rods, and the yielding spacefor accommodating the flexible section can be defined by a stationaryshell, a first lifting plate and a second lifting plate collectively tofit the flexible section according to the bending degree of the flexiblescreen.

The present invention further provides a foldable electronic device,which includes a linkage mechanism different from the aforementionedconventional linkage mechanism. A weakening structure is formed on thesupporting plate of the flexible screen and is corresponding to theflexible section.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide a foldableelectronic device which has a plurality of operating mechanism. Each ofthe operating mechanism includes a driving shaft, a wing rod, and aconnecting rod. The driving shaft, the wing rod, and the connecting rodare pivotally connected to the central body, and the wing rod and theconnecting rod are further connected to the driving shaft. An end of thewing rod and an end of the connecting rod are able to slide in an arcgroove and a sliding groove of the driving shaft respectively toprovide, with other components, a yielding space for accommodating aflexible section. When the foldable electronic device of the presentinvention is in the folded status, the two lifting plates moves inresponse to the movement of the driving shaft, the wing rod and theconnecting rod, the central body and the lifting plate collectivelydefine a yielding space suitable for accommodating the flexible sectionaccording to a bending degree of the flexible section of the flexiblescreen. The supporting plate disposed at the bottom of the flexiblescreen has a weakening structure which is located corresponding to theflexible section to provide support to the flexible screen when theflexible screen is bent.

To achieve the aforesaid objective, the present invention discloses afoldable electronic device which includes a central body, a linkageunit, a first operating mechanism, a second operating mechanism, a firstpanel body, a second panel body, and a flexible screen. The central bodyincludes a stationary shell, an accommodating space, a first shaft and asecond shaft. The stationary shell defines the accommodating space, thefirst shaft and the second shaft are disposed in the accommodatingspace, the first shaft extends along a first central axis, and thesecond shaft extends along a second central axis. The linkage unitincludes a first driving shaft and a second driving shaft. The firstdriving shaft is pivotally connected to the stationary shell on a firstrotating axis and has a first sliding groove and a first arc groove, andthe second driving shaft is pivotally connected to the stationary shellon a second rotating axis and has a second sliding groove and a secondarc groove. The first operating mechanism includes a first wing rod, afirst lifting plate, and a first connecting rod. The first wing rod ispivotally connected to the stationary shell on a first pivoting axis andis pivotally connected to the first driving shaft. The first wing rodhas a first supporting surface and a first protruding end. The firstprotruding end is slidably disposed in the first arc groove. The firstlifting plate is fixed to the first wing rod and has a first liftingsurface substantially contacting with the first supporting surface inparallel. The first connecting rod is fixed to the first shaft and ispivotally connected to the first driving shaft. A first rod end of thefirst connecting rod is slidably disposed in the first sliding groove.The second operating mechanism includes a second wing rod, a secondlifting plate, and a second connecting rod. The second wing rod ispivotally connected to the stationary shell on a second pivoting axisand is pivotally connected to the second driving shaft. The second wingrod has a second supporting surface and a second protruding end. Thesecond protruding end is slidably disposed in the second arc groove. Thesecond lifting plate is fixed to the second wing rod and has a secondlifting surface substantially contacting with the second supportingsurface in parallel. The second connecting rod is fixed to the secondshaft and is pivotally connected to the second driving shaft. A secondrod end of the second connecting rod is slidably disposed in the slidinggroove sliding groove. The first panel body is disposed on one side ofthe stationary shell and is linking up with the first driving shaft. Thesecond panel body is disposed on another side of the stationary shelland is linking up with the second driving shaft. The flexible screen isdisposed on the first panel body and second panel body and defines aflexible section, wherein the flexible screen includes a supportingplate connecting with the first panel plate and the second panel plate,and a multi-layer structure being disposed on the supporting plate, andwherein the supporting plate has a weakening structure corresponding tothe flexible section. The first panel body and the second panel body aretransformed between an unfolded status and a folded status. When thefirst panel body and the second panel body are in the unfolded status,the flexible screen is flattened, and the first wing rod, the firstlifting plate, the second wing rod, the second lifting plate and thestationary shell collectively support the flexible section. When thefirst panel body and the second panel body are in the folded status, theweakening structure allows the flexible screen to bend at the flexiblesection, and the first wing rod, the first lifting plate, the secondwing rod, the second lifting plate and the stationary shell collectivelydefine a yielding space for accommodating the flexible section.

When the first panel body and the second panel body are transformed fromthe unfolded status to the folded status, the first panel body drivesthe first driving shaft rotate about the first rotating axis, the secondpanel body drives the second driving shaft rotate about the secondrotating axis, the first protruding end and the second protruding endslide in the first arc groove and the second arc groove respectively,the first rod end and the second rod end slide in the first slidinggroove and the second sliding groove respectively, the first connectingrod and the second connecting rod correspondingly rotate about the firstcentral axis and the second central axis respectively, and the firstwing rod and the second wing rod correspondingly rotate about the firstpivoting axis and the second pivoting axis respectively, and drive thefirst lifting plate and the second lifting plate respectively to rotatewith respect to the stationary shell.

The flexible section further has a first deformation area, a seconddeformation area and a third deformation area disposed between the firstdeformation area and the second deformation area. The first deformationarea corresponds to the first panel body, the second deformation areacorresponds to the second panel body, and the third deformation areacorresponds to the central body.

The weakening structure further has a plurality of first groove groupsand a plurality of second groove groups which are respectively extendingalong a first longitudinal direction and alternately arranged with eachother in a main longitudinal direction, wherein the first longitudinaldirection is parallel to the first central axis and the second centralaxis, and perpendicular to the main longitudinal direction. Theweakening structure is able to bend in the main longitudinal directionwhen the first panel body and the second panel body are transformed fromthe unfolded status to the folded status.

Each of the first groove groups has a plurality of first groove portionssequentially arranged along the first longitudinal direction, and eachof the second groove groups has a plurality of second groove portionssequentially arranged along the first longitudinal direction, andwherein the first groove portion and the second groove portion, whichare adjacent, are staggered from each other.

Each of the first groove portions has a first groove, and each of thesecond groove portions has a second groove, and wherein the first grooveand the second groove penetrate through the supporting platerespectively.

In one embodiment, the first deformation area, the second deformationarea and the third deformation area are continuously arranged.

When the first panel body and the second panel body are in the unfoldedstatus, the first lifting surface and the second lifting surface aresubstantially coplanar; and when the first panel body and the secondpanel body are in the folded status, the first lifting surface and thesecond lifting surface are substantially spaced apart and in parallel.

The first central axis, the second central axis, the first rotatingaxis, the second rotating axis, the first pivoting axis, and the secondpivoting axis are not overlapping.

The first driving shaft further has a first main body and a firstprotruding part, the first main body extends along the main longitudinaldirection, the first protruding part is disposed on the first main body,the first arc groove extends from the first main body to the firstprotruding part, and the first sliding groove is formed on the firstmain body. The second driving shaft further has a second main body and asecond protruding part, the second main body extends along the mainlongitudinal direction, the second protruding part is disposed on thesecond main body, the second arc groove extends from the second mainbody to the second protruding part, and the second sliding groove isformed on the second main body.

The main longitudinal direction is perpendicular to the first centralaxis and the second central axis. The first driving shaft further has afirst embedding slot formed on the first main body and communicated withthe first sliding groove. The first connecting rod further has a firstrod body connected with the first rod end and accommodated in the firstembedding slot. The second driving shaft further has a second embeddingslot formed on the second main body and communicated with the secondsliding groove. The second connecting rod further has a second rod bodyconnected with the second rod end and accommodated in the secondembedding slot.

The first driving shaft is pivotally connected with the first connectingrod on a first connecting axis, and pivotally connected with the firstwing rod on a first subordinate connecting axis. The second drivingshaft is pivotally connected with the second connecting rod on a secondconnecting axis, and pivotally connected with the second wing rod on asecond subordinate connecting axis.

The first panel body includes a first outer surface distant from theflexible screen, and the second panel body includes a second outersurface distant from the flexible screen. When the first panel body andthe second panel body are in the unfolded status, a perpendicular linesegment between the first subordinate connecting axis and the firstpivoting axis is more distant from the first outer surface than aperpendicular line segment between the first connecting axis and thefirst central axis, and a perpendicular line segment between the secondsubordinate connecting axis and the second pivoting axis is more distantfrom the second outer surface than a perpendicular line segment betweenthe second connecting axis and the second central axis. When the firstpanel body and the second panel body are in the folded status, theperpendicular line segment between the first subordinate connecting axisand the first pivoting axis is more adjacent to the first outer surfacethan the perpendicular line segment between the first connecting axisand the first central axis, and the perpendicular line segment betweenthe second subordinate connecting axis and the second pivoting axis ismore adjacent to the second outer surface than the perpendicular linesegment between the second connecting axis and the second central axis.

The first panel body further includes a first side shell and a firstsupport block and is disposed on one side of the stationary shell to beoperatively linked with the first driving shaft. The first support blockis disposed in the first side shell. The first lifting plate is disposedbetween the first support block and the stationary shell to operate inthe first side shell correspondingly. The second panel body furtherincludes a second side shell and a second support block and is disposedon the other side of the stationary shell to be operatively linked withthe second driving shaft. The second support block is disposed in thesecond side shell, and the second lifting plate is disposed between thesecond support block and the stationary shell to operate in the secondside shell correspondingly.

The first panel body further includes a first covering plate and aplurality of first inserting columns. The first inserting columns areformed on the first covering plate with intervals and pass through theflexible screen and the first support block to be fixed to the firstside shell. The second panel body further includes a second coveringplate and a plurality of second inserting columns. The second insertingcolumns are formed on the second covering plate with intervals and passthrough the flexible screen and the second support block to be fixed tothe second side shell. The first covering plate, the first side shell,the second covering plate and the second side shell hold the flexiblescreen collectively.

In an embodiment of the present invention, the foldable electronicdevice further includes a first positioning module. The firstpositioning module has a first driving cam, a first driven cam and afirst elastic member. The first driving cam is fixed to the first shaft,and has a first main-tooth. The first driven cam is slidably sleeved onthe first shaft along the first central axis and has a first toothspace, a second tooth space and a first sub-tooth. The first sub-toothis located between the first tooth space and the second tooth space. Thefirst elastic element is disposed between the first driven cam and afixed plate of the stationary shell. When the first panel body and thesecond panel body are in the unfolded status, the first main-tooth islocated in the first tooth space. When the first panel body and thesecond panel body are in a half-folded status, the first main-toothabuts against the first sub-tooth so that the first elastic element iscompressed. When the first panel body and the second panel body are inthe folded status, the first main-tooth moves into the second toothspace, and the first elastic element is released.

The foldable electronic device further includes a second positioningmodule. The second positioning module includes a second driving cam, asecond driven cam and a second elastic element. The second driving camis fixed to the second shaft, and has a second main-tooth. The seconddriven cam is slidably sleeved on the second shaft along the secondcentral axis and has a third tooth space, a fourth tooth space and asecond sub-tooth. The second sub-tooth is located between the thirdtooth space and the fourth tooth space. The second elastic element isdisposed between the second driven cam and the fixed plate of thestationary shell. When the first panel body and the second panel bodyare in the unfolded status, the second main-tooth is located in thethird tooth space. When the first panel body and the second panel bodyare in the half-folded status, the second main-tooth abuts against thesecond sub-tooth so that the first elastic element and the secondelastic element are compressed. When the first panel body and the secondpanel body are in the folded status, the second main-tooth moves intothe fourth tooth space, and the second elastic element is released.

The foldable electronic device of the present invention further includesa synchronous module, which has a first gear and a second gear. Thefirst gear is sleeved on the first shaft, the second gear is sleeved onthe second shaft, and the first gear and the second gear are engagedwith each other. When the first shaft rotates about the first centralaxis or the second shaft rotates about the second central axis, thefirst gear or the second gear rotates correspondingly and drives thesecond gear or the first gear to rotate so that the second shaft or thefirst shaft rotates synchronously with the second gear or the first gearcorrespondingly.

In one embodiment of the present invention, the first shaft, the secondshaft, the linkage unit, the first wing rod, the first connecting rod,the second wing rod, the second connecting rod, the first positioningmodule, the second positioning module and the synchronous module areduplicated and disposed on two sides of the stationary shellrespectively and correspondingly.

The detailed technology and preferred embodiments implemented for thepresent invention are described in the following paragraphs accompanyingthe appended drawings for people skilled in this field to wellappreciate the features of the claimed invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic view of the foldable electronicdevice in the unfolded status according to the present invention;

FIG. 2 is an explosive view of the foldable electronic device accordingto the present invention;

FIG. 3 is an assembly view of the central body, the first positioningmodule, the second positioning module and the synchronous module of thefoldable electronic device according to the present invention;

FIG. 4 is an explosive view of the central body, the first positioningmodule, the second positioning module and the synchronous module of thefoldable electronic device according to the present invention;

FIG. 5 and FIG. 6 are three-dimensional schematic views of the firstdriving shaft of the foldable electronic device from different viewingangles according to the present invention;

FIG. 7 is an assembly view of the linkage unit, the first operatingmechanism and the second operating mechanism of the foldable electronicdevice according to the present invention;

FIG. 8 is an explosive view of the linkage unit, the first operatingmechanism and the second operating mechanism of the foldable electronicdevice according to the present invention;

FIG. 9 is a partial explosive view of the linkage unit and the firstoperating mechanism of the foldable electronic device according to thepresent invention;

FIG. 10 is a partial three-dimensional schematic view of the foldableelectronic device in the unfolded status according to the presentinvention;

FIG. 11 is a partial explosive view of the first panel body and thesecond panel body of the foldable electronic device according to thepresent invention;

FIG. 12 is an assembly view of the first panel body and the firstdriving shaft of the foldable electronic device according to the presentinvention;

FIG. 13 is a partial explosive view of the first positioning module andthe second positioning module of the foldable electronic deviceaccording to the present invention;

FIG. 14 is a three-dimensional schematic view of the synchronous moduleof the foldable electronic device according to the present invention;

FIG. 15 is a partial three-dimensional schematic view of the foldableelectronic device shown in FIG. 10 ;

FIG. 16 is a partial three-dimensional side view of the foldableelectronic device shown in FIG. 10 ;

FIG. 17 is a three-dimensional schematic view of the synchronous moduleof the foldable electronic device shown in FIG. 10 ;

FIG. 18 is a three-dimensional schematic view of the first positioningmodule and the second positioning module of the foldable electronicdevice shown in FIG. 10 ;

FIG. 19 is a three-dimensional schematic view of the foldable electronicdevice in half-folded status according to the present invention;

FIG. 20 is a partial three-dimensional schematic view of the foldableelectronic device shown in FIG. 19 ;

FIG. 21 is another partial three-dimensional schematic view of thefoldable electronic device shown in FIG. 19 ;

FIG. 22 is a partial side view of the foldable electronic device shownin FIG. 19 ;

FIG. 23 is a side view of the first positioning module and thesynchronous module of the foldable electronic device shown in FIG. 19 ;

FIG. 24 is a partial three-dimensional schematic view of the firstpositioning module and the second positioning module of the foldableelectronic device shown in FIG. 19 ;

FIG. 25 is a partial three-dimensional schematic view of the synchronousmodule of the foldable electronic device shown in FIG. 19 ;

FIG. 26 is a three-dimensional schematic view of the foldable electronicdevice in folded status according to the present invention;

FIG. 27 is a partial three-dimensional schematic view of the foldableelectronic device shown in FIG. 26 ;

FIG. 28 is a partial side view of the foldable electronic device shownin FIG. 26 ;

FIG. 29 is a partial three-dimensional schematic view of the synchronousmodule of the foldable electronic device shown in FIG. 26 ;

FIG. 30 is a partial three-dimensional schematic view of the firstpositioning module and the second positioning module of the foldableelectronic device shown in FIG. 26 ;

FIG. 31 is an explosive view of the flexible screen of the foldableelectronic device according to the present invention;

FIG. 32 is a partial side view of the flexible screen of the foldableelectronic device in folded status according to the present invention;

FIG. 33 is a plan view of the supporting plate of the foldableelectronic device of another embodiment according to the presentinvention; and

FIG. 34 is a plan view of the supporting plate of the foldableelectronic device according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will now be made in detail to the present embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings, and are not intended to limit the present invention,applications or particular implementations described in theseembodiments. Wherever possible, the same reference numbers are used inthe drawings and the description to refer to the same or like parts. Itshall be appreciated that, in the following embodiments and the attacheddrawings, elements unrelated to the present invention are omitted fromdepiction; and dimensional relationships among individual elements inthe attached drawings are provided only for ease of understanding, butnot to limit the actual scale.

As shown in FIG. 1 and FIG. 2 , the foldable electronic device 1000 ofthe present invention takes a foldable mobile phone as an example. Thefoldable electronic device 1000 includes a central body 1, two linkageunits 2, a first operating mechanism 3, a second operating mechanism 4,a first panel body 5, a second panel body 6, a flexible screen 7, twofirst positioning modules 81, two second positioning modules 82 and twosynchronization modules 9.

As shown in FIG. 3 and FIG. 4 , the central body 1 includes a stationaryshell 11, an accommodating space 12, two first shafts 13, two secondshafts 14 and two fixed plates 15. The stationary shell 11 extendssubstantially parallel to a first central axis C1 and a second centralaxis C2, and has two ends 111 and two extending plates 113. Eachextending plate 113 extends from each end 111. The stationary shell 11defines the accommodating space 12. The first shaft 13 and the secondshaft 14 are disposed in the accommodating space 12. The first shafts 13are spaced apart and extend along the first central axis C1, and thesecond shafts 14 are spaced apart and extend along the second centralaxis C2. Each first shaft 13 and each second shaft 14 are arranged sideby side at each end 111 of the stationary shell 11 and abut against eachextending plate 113. The fixed plates 15 are spaced apart from eachother and are arranged at the center of the stationary shell 11.

Reference is made to FIG. 5 , FIG. 6 and FIG. 7 , each linkage unit 2 isdisposed at each end 111 of the stationary shell 11 respectively, andhas a first driving shaft 21 and a second driving shaft 22. The firstdriving shaft 21 has a first main body 211, a first protruding part 212,a first arc groove 213, a first sliding groove 214 and a first embeddingslot 215. The first main body 211 extends along a main longitudinaldirection T, and the first protruding part 212 is disposed on the firstmain body 211 and has a first protruding surface 2121. The first arcgroove 213 extends from the first main body 211 to the first protrudingpart 212. The first embedding slot 215 and the first sliding groove 214are respectively formed on the first main body 211, and the firstembedding slot 215 communicates with the first sliding groove 214. Thesecond driving shaft 22 is symmetrical to the first driving shaft 21,and has a second main body 221, a second protruding part 222, a secondarc groove 223, a second sliding groove 224 and a second embedding slot225. The second main body 221 also extends along the main longitudinaldirection T. The second protruding part 222 is disposed on the secondmain body 221 and has a second protruding surface 2221. The second arcgroove 223 extends from the second main body 221 to the secondprotruding part 222. The second embedding slot 225 and the secondsliding groove 224 are respectively formed on the second main body 221,and the second embedding slot 225 communicates with the second slidinggroove 224. The first driving shaft 21 is pivotally connected to thestationary shell 11 on the first rotating axis L1. The second drivingshaft 22 is pivotally connected to the extending plate 113 of thestationary shell 11 on the second rotating axis L2.

Reference is made to FIG. 7 , FIG. 8 and FIG. 9 , the first operatingmechanism 3 has two first wing rods 31, a first lifting plate 32 and twofirst connecting rods 33. Each of the first wing rods 31 has a firstsupporting surface 311 and a first protruding end 312, and is pivotallyconnected to each first driving shaft 21 and each end 111 of thestationary shell 11 on a first pivoting axis M1. Thereby, each of thefirst protruding ends 312 is slidably disposed in the first arc groove213 on the first subordinate connecting axis O1. The first lifting plate32 is fixed between the first wing rods 31 and has a first liftingsurface 321 substantially contacting with the first supporting surface311 in parallel. Each of the first connecting rods 33 is fixed to eachof the first shafts 13 correspondingly, and is pivotally connected tothe first driving shaft 21 on a first connecting axis N1. Each of thefirst connecting rods 33 has a first rod body 331 and a first rod end332. The first rod body 331 is connected to the first rod end 332. Whenfirst rod end 332 is slidably disposed in the first sliding groove 214,the first rod body 331 is located in the first embedding slot 215correspondingly.

Similarly, the second operating mechanism 4 has two second wing rods 41,a second lifting plate 42 and two first connecting rods 43. Each of thesecond wing rods 41 has a second supporting surface 411 and a secondprotruding end 412, and each of the second wing rods 41 is pivotallyconnected to each end 111 of the stationary shell 11 on a secondpivoting axis M2, and is pivotally connected to each of the seconddriving shafts 22. Thereby, each of the second protruding ends 412 isslidably disposed in the second arc groove 223 on the second subordinateconnecting axis O2. The second lifting plate 42 is fixed between thesecond wing rods 41 and has a second lifting surface 421 substantiallycontacting with the second supporting surface 411 in parallel. Each ofthe second connecting rods 43 is fixed to each of the second shafts 14correspondingly, and is pivotally connected to the second driving shaft22 on a second connecting axis N2. Each of the second connecting rods 43has a second rod body 431 and a second rod end 432. The second rod body431 is connected to the second rod end 432. When the second rod end 432is slidably disposed in the second sliding groove 224, the second rodbody 431 is located in the second embedding slot 225 correspondingly.

In this embodiment, the first central axis C1, the second central axisC2, the first rotating axis L1, the second rotating axis L2, the firstpivoting axis M1, and the second pivoting axis M2 are not overlapping.Preferably, the first central axis C1, the second central axis C2, thefirst rotating axis L1, the second rotating axis L2, the first pivotingaxis M1, and the second pivoting axis M2 are parallel to each other.

Reference is made to FIG. 10 , FIG. 11 and FIG. 12 , the first panelbody 5 includes a first side shell 51, a first support block 52, a firstcovering plate 53, a plurality of first inserting columns 54, a firstinner surface 55 and a first outer surface 56. The first inner surface55 is opposite to the first outer surface 56. The first driving shaft 21abuts against and is fixed to the first inner surface 55 and is locatedin two ends of the first side shell 51 respectively, so that the firstpanel body 5 can be linked with the first driving shaft 21. The firstsupport block 52 is disposed in the first side shell 51, and the firstlifting plate 32 is located between the first support block 52 and thestationary shell 11 and can correspondingly move in the first side shell51. The first inserting columns 54 are formed on the first coveringplate 53 with intervals and roughly in U-shaped, and pass through theflexible screen 7 and the first support block 52 to be fixed to thefirst side shell 51.

The second panel body 6 includes a second side shell 61, a secondsupport block 62, a second covering plate 63, a plurality of secondinserting columns 64, a second inner surface 65 and a second outersurface 66. The second inner surface 65 is opposite to the second outersurface 66. The second driving shaft 22 abuts against and is fixed tothe second inner surface 65 and is located in two ends of the secondside shell 61 respectively, so that the second panel body 6 can belinked with the second driving shaft 22. The second support block 62 isdisposed in the second side shell 61, and the second lifting plate 42 islocated between the second support block 62 and the stationary shell 11and can correspondingly move in the second side shell 61. The secondinserting columns 64 are formed on the second covering plate 63 withintervals and roughly in U-shaped, and pass through the flexible screen7 and the second support block 62 to be fixed to the second side shell61.

Through the combination of the first panel body 5, the second panel body6 and the flexible screen 7, the first covering plate 53, the first sideshell 51, the second covering plate 63 and the second side shell 61 cancollectively clamp the flexible screen 7, and the first outer surface 56and the second outer surface 66 are both distant from the flexiblescreen 7. The first panel body 5 and the second panel body 6 can betransformed between an unfolded state (as shown in FIG. 10 ) and afolded state (as shown in FIG. 26 ). The first panel body 5 and thesecond panel body 6 respectively include electronic components such ascircuit boards or connecting wires which are electrically connected tothe flexible screen 7, and the relevant details are not describedherein.

Referring to FIG. 31 , the flexible screen 7 defines a flexible section71 and includes a multi-layer structure 72 and a supporting plate 73.The multi-layer structure 72 is disposed on the supporting plate 73 andhas an OLED layer, at least one protective layer and at least oneadhesive layer (not shown in the figures), and the number andarrangement of the aforesaid layers can be adjusted according to theactual practices, and is not limited thereto. In this embodiment, thesupporting plate 73 has a weakening structure 731 disposed correspondingto the flexible section 71. Specifically, the supporting plate 73 isdisposed at the bottom of the flexible screen 7, and connects to thefirst panel body 5 and the second panel body 6. When the first panelbody 5 and the second panel body 6 are in the unfolded status, theflexible section 71 is flattened, and the stationary shell 11, the firstlifting plate 32, the first wing rod 31, the second lifting plate 42 andthe second wing rod 41 collectively support the flexible section 71.When the first panel body 5 and the second panel body 6 are in thefolded status, the flexible section 71 is bent, and the stationary shell11, the first lifting plate 32 and the second lifting plate 42collectively define a yielding space S (as shown in FIG. 28 ), bysettlement, for accommodating the flexible section 71.

As mentioned above, referring to FIG. 32 and FIG. 1 , the flexiblesection 71 can be distinguished as a first deformation area 711, asecond deformation area 712, and a third deformation area 713. The thirddeformation area 713 is disposed between the first deformation area 711and the second deformation area 712. The first deformation area 711corresponds to the first panel body 5, the second deformation area 712corresponds to the second panel body 6, and the third deformation area713 corresponds to the central body 1. In this embodiment, the firstdeformation area 711, the third deformation area 713 and the seconddeformation area 712 are continuously arranged. In another embodiment,the first deformation area 711, the third deformation area 713, and thesecond deformation area 712 can be discontinuously arranged and apartfrom each other (as shown in FIG. 33 ). The size and position of theintervals between the deformation areas may be adjusted according toactual bending requirements in view of the structural support andflexibility of the flexible section 71, which is not limited thereto.

The weakening structure 731 will be illustrated hereinafter. Theweakening structure 731 of the present invention is formed by aplurality of parallel grooves in the same direction and arrangedalternately with each other. In detail, please referring to FIG. 34 ,the weakening structure 731 further has a plurality of first groovegroups 7311 and a plurality of second groove groups 7312. The firstgroove groups 7311 and the second groove groups 7312 extend along afirst longitudinal direction Q respectively and are alternately arrangedwith each other in the main longitudinal direction T. In other words,the first groove groups 7311 and the second groove groups 7312 areparallelly arranged in the manner of one following the other. The firstlongitudinal direction Q is parallel to the first central axis C1 andthe second central axis C2, and perpendicular to the main longitudinaldirection T. The weakening structure 731 is able to bend in the mainlongitudinal direction T when the first panel body 5 and the secondpanel body 6 are transformed from the unfolded status to the foldedstatus. In the meantime, the yielding space S is formed to accommodatethe weakening structure 731 of the supporting plate 73. Morespecifically, in this embodiment, each row of the first groove groups7311 includes a plurality of first groove portions 73111 sequentiallyarranged along the first longitudinal direction Q, and each row of thesecond groove groups 7312 includes a plurality of second groove portions73121 sequentially arranged along the first longitudinal direction Q.The adjacent first groove portion 73111 and the second groove portion73121 are staggered from each other. Each of the first groove portions73111 has a first groove X1, and each of the second groove portions73121 has a second X2. Specifically, each of the first groove portions73111 refers to the first groove X1 and the peripheral enclosing anddefining the first groove X1, and each of the second groove portions73121 refers to the second groove X2 and the peripheral enclosing anddefining the second groove X2. The first groove X1 and the second grooveX2 penetrate through the supporting plate 73 respectively. In otherwords, the weakening structure 731 is formed by the interconnection ofthese peripherals. In another embodiment, the first groove X1 and thesecond groove X2 may not penetrate through the supporting plate 73 asbeing like a single-sided groove structure formed on the supportingplate 73 on the side adjacent to the first panel body 5 and the secondpanel body 6. The objective is that the supporting plate 73 can be benteasily as well as bear the bending stress in the first deformation area711, the second deformation area 712, and the third deformation area713. The position of the aforementioned single-sided groove structure onthe supporting plate 73 may be adjusted according to the bending stressgenerated when the supporting plate 73 is bent, which is not limitedthereto.

More specifically, the width and depth of the first groove X1 and thesecond groove X2 or the interval between any two adjacent first groovegroup 7311 and second groove group 7312 can be further adjustedaccording to the tensile stress or compressive stress generated frombending the supporting plate 73. For example, since the extent ofbending on the third deformation area 713 is the largest, the intervalof adjacent groove groups can be the densest, and the width of thegroove on the third deformation area 713 can be smaller than that on thefirst deformation area 711 or the second deformation area 712.

Referring to FIG. 3 , FIG. 4 and FIG. 13 , each of the first positioningmodules 81 has a first driving cam 811, a first driven cam 812 and afirst elastic element 813. The first driving cam 811 is fixed to thefirst shaft 13 and has two first main-teeth 8111. The first driven cam812 is slidably sleeved on the first shaft 13 along the first centralaxis C1 and has two first sub-teeth 8121, two first tooth spaces 8122and two second tooth spaces 8123. Each of the first sub-teeth 8121 islocated between the first tooth space 8122 and the second tooth space8123. The first elastic element 813 is disposed between the first drivencam 812 and a fixed plate 15. The first driving cam 811 is adapted torotate with the first shaft 13 about the first central axis C1, and thenpush the first driven cam 812 to slide on the first shaft 13 tocorrespondingly compress or release the first elastic element 813.

Each of the second positioning modules 82 has a second driving cam 821,a second driven cam 822 and a second elastic element 823. The drivingcam 821 is fixed to the second shaft 14 and has two second main-teeth8211. The second driven cam 822 is slidably sleeved on the second shaft14 along the second central axis C2 and has two third tooth spaces 8222,two fourth tooth spaces 8223 and two second sub-teeth 8221. Each of thesecond sub-teeth 8221 is located between the third tooth space 8222 andthe fourth tooth space 8123. The second elastic element 823 is disposedbetween the second driven cam 822 and the fixed plate 15. The seconddriving cam 821 is adapted to rotate with the second shaft 14 about thesecond central axis C2, and then push the second driven cam 822 to slideon the second shaft 14 to correspondingly compress or release the firstelastic element 813. In this embodiment, the first driven cam 812 andthe second driving cam 821 are formed integrally, but not limitedthereto.

Reference is made to FIG. 14 , each synchronous module 9 has a firstgear 91 and a second gear 92. Each first gear 91 is sleeved on eachfirst shaft 13, and each second gear 92 is sleeved on each second shaft14. Each first gear 91 and each second gears 92 are engaged with eachother. In this embodiment, the first gear 91 and the second gear 92partially have teeth respectively, but not limited thereto.

Following describes operations of the foldable electronic device 1000.When an external force is applied to the first panel body 5, the secondpanel body 6 is correspondingly linked and can be transformed betweenthe unfolded state (as shown in FIG. 1 and FIG. 10 ) and the foldedstate (as shown in FIG. 26 ).

Please refer to FIG. 10 , FIG. 15 and FIG. 16 , when the first panelbody 5 and the second panel body 6 are in the unfolded status, the firstouter surface 56 and the second outer surface 66 are substantiallycoplanar. A perpendicular line segment O1M1 between the firstsubordinate connecting axis O1 and the first pivoting axis M1 is moredistant from the first outer surface 56 than a perpendicular linesegment N1C1 between the first connecting axis N1 and the first centralaxis C1. A perpendicular line segment O2M2 between the secondsubordinate connecting axis O2 and the second pivoting axis M2 is moredistant from the second outer surface 66 than a perpendicular linesegment N2C2 between the second connecting axis N2 and the secondcentral axis C2. In other words, the first lifting plate 32 and thesecond lifting plate 42 are respectively in the supporting position R1,and are respectively having a longest perpendicular distance d1 with thefirst outer surface 56 and the second outer surface 66. In thissituation, the flexible screen 7 is flattened, and the first wing rod31, the first lifting plate 32, the second wing rod 41, the secondlifting plate 42 and the stationary shell 11 collectively support theflexible section 71 to provide a stable support, so that the user maytouch the flexible section 71, and the image or screen display in theflexible section 71 will not be badly bent. In this unfolded status, theyielding space S (as shown in FIG. 16 ) defines a minimum volume, andthe volume of which almost approaches zero. Also, in this unfoldedstate, the first protruding end 312 is located at one end of the firstarc groove 213 (i.e., the relative upper end shown in FIG. 16 ), thefirst rod end 332 is located at one end of the first sliding groove 214,and the second protruding end 412 is located at one end of the secondarc groove 223 (i.e., the relative upper end shown in FIG. 16 ), thesecond rod end 432 is located at one end of the second sliding groove224. As shown in FIG. 17 and FIG. 18 , the first gear 91 and the secondgear 92 are engaged at a first engaging position W1, the firstmain-teeth 8111 are located in the first tooth space 8122, and thesecond main-teeth 8211 are located in the third tooth space 8222. Inthis case, the first elastic element 813 and the second elastic element823 are in a released state without being compressed.

Following describes operations of each element when the first panel body5 and the second panel body 6 are transformed from the unfolded statusto the folded status. An example is that an external force is applied tothe first panel body 5 to rotate relative to the stationary shell 11,the first panel body 5 drives the first driving shaft 21 to rotate aboutthe first rotating axis L1 to make the first protruding end 312 slide inthe first arc groove 213, and to make the first rod end 332 slide in thefirst sliding groove 214, thereby the first wing rod 31 rotates aboutthe first pivoting axis M1, and the first connecting rod 33 rotatesabout the first central axis C1. When the first connecting rod 33rotates, the first shaft 13 is also driven to rotate about the firstcentral axis C1, and the first driving cam 811 and the first gear 91 arealso driven to rotate. During the rotation of the first driving cam 811,the first main-tooth 8111 of the first driving cam 811 gradually movesaway from the first tooth space 8122, so as to push the first driven cam812 correspondingly, and thus the first elastic element 813 is graduallycompressed by the first driven cam 812.

As mentioned above, when the first gear 91 rotates, the second gear 92rotates synchronously and correspondingly, driving the second shaft 14to rotate about the second central axis C2, thereby the secondconnecting rod 43 rotates about the second central axis C2, the secondrod end 432 slides in the second sliding groove 224, the secondprotruding end 412 slides in the second arc groove 223, whereby thesecond wing rod 41 rotates about the second pivoting axis M2, and thesecond driving shaft 22 rotates about the second rotating axis L2, andcorrespondingly drives the second panel body 6 to rotate relative to thestationary shell 11. When the second shaft 14 rotates, the seconddriving cam 821 gradually moves away from the third tooth space 8222 topush the second driven cam 822 correspondingly, so that the secondelastic element 823 is gradually compressed by the second driven cam822.

According to above operations, when the first panel body 5 and thesecond panel body 6 rotate to have an angle of 90 degrees with eachother as shown in FIG. 19 . Referring to FIG. 20 to FIG. 22 , the firstprotruding end 312 and the second protruding end 412 are in the middleof the first arc groove 213 and the second arc groove 223 respectively,the first rod end 332 and the second rod end 432 are in the middle ofthe first sliding groove 214 and the second sliding groove 224respectively, the first main-tooth 8111 and the second main-tooth 8211abut against the first sub-tooth 8121 and the second sub-tooth 8221respectively (as shown in FIG. 24 ), the first elastic element 813 andthe second elastic element 823 are compressed by the first driven cam812 and the second driven cam 822 respectively (as shown in FIG. 23 ),and the first gear 91 and the second gear 92 rotate to a second engagingposition W2 to engage with each other (as shown in FIG. 25 ). At thistime, since the part of the flexible screen 7 disposed on the firstpanel body 5 and the second panel body 6 is fixed, the flexible section71 will be slightly bent (see FIG. 22 ) to avoid improper extrusion orcrushing. The first lifting plate 32 and the second lifting plate 42 arelocated at a transition position R2 and are more adjacent to the firstouter surface 56 and the second outer surface 66 respectively, so thatthe volume of the yielding space S collectively defined by the firstwing rod 31, the first lifting plate 32, the second wing rod 41, thesecond lift plate 42 and the stationary shell 11 increases.

When the external force is continuously applied to the first panel body5, the first driving shaft 21 continues to driving the first wing rod 31and the first connecting rod 33 to rotate, and the first shaft 13rotates correspondingly to rotate the first gear 91, then the secondgear 92 rotate correspondingly, the second shaft 14, the secondconnecting rod 43, the second wing rod 41, and the second driving shaft22 continue to rotate correspondingly until the first panel body 5 andthe second panel body 6 are in the folded state as shown in FIG. 26 andFIG. 27 . Referring to FIG. 28 to FIG. 30 , the first lifting surface321 and the second lifting surface 421 are substantially parallel toeach other, and the flexible section 71 is completely bent (with a waterdrop-shaped cross section). At this time, the first protruding end 312is located at another end of the first arc groove 213, the first rod end332 is located at another end of the first sliding groove 214, thesecond protruding end 412 is located at another end of the second arcgroove 223, the second rod end 432 is located at another end of thesecond sliding groove 224, the first main-tooth 8111 slides to thesecond tooth space 8123, the second main-tooth 8211 slides to the fourthtooth space 8223, the elastic force of the first elastic element 813 andthe second elastic element 823 are released, and the first gear 91 andthe second gear 92 are engaged with each other at a third engagingposition W3.

As mentioned above, as shown in FIG. 28 , the perpendicular line segmentO1M1 between the first subordinate connecting axis O1 and the firstpivoting axis M1 is more adjacent to the first outer surface 56 than theperpendicular line segment N1C1 between the first connecting axis N1 andthe first central axis C1. The perpendicular line segment O2M2 betweenthe second subordinate connecting axis O2 and the second pivoting axisM2 is more adjacent to the second outer surface 66 than theperpendicular line segment N2C2 between the second connecting axis N2and the second central axis C2. In other words, the first lifting plate32 and the second lifting plate 42 are respectively in a descendingposition R3, and are respectively having a shortest perpendiculardistance d2 with the first outer surface 56 and the second outer surface66. In this situation, the stationary shell 11, the first wing rod 31,the first lifting plate 32, the second wing rod 41, and the secondlifting plate 42 collectively define the yielding space S which has amaximum volume to accommodate the flexible section 71.

According to the above, the technical feature of the present inventionis that through the assembly of the first driving shaft 21, the firstwing rod 31 and the first connecting rod 33, and the assembly of thesecond driving shaft 22, the second wing rod 41 and the secondconnecting rod 43, the yielding space S defined by the first liftingplate 32, the second lifting plate 42 and the stationary shell 11changes corresponding to the bending state of the flexible section 71.As shown in FIG. 10 , when the first panel body 5 and the second panelbody 6 are in the unfolded state, the flexible section 71 is flattened(i.e., minimum bending degree), so there is no need to save too muchspace for the flexible section 71. Thus, the yielding space S iscorrespondingly defined to have minimum volume. As shown in FIG. 26 andFIG. 28 , when the first panel body 5 and the second panel body 6 are inthe folded state, the flexible section 71 is bent with largest degree,so it is necessary to save biggest space for the flexible section 71.Thus, the yielding space S is correspondingly defined to have maximumvolume for accommodating and protecting the flexible section 71. Inaddition, another feature of the present invention is that the flexiblescreen 7 has the supporting plate 73 and the weakening structure 731corresponding to the flexible section 71 to support the flexible screen7 and bear the bending stress.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims

What is claimed is:
 1. A foldable electronic device, comprising: acentral body comprising a stationary shell, an accommodating space, afirst shaft and a second shaft, wherein the stationary shell defines theaccommodating space, the first shaft and the second shaft are disposedin the accommodating space, the first shaft extends along a firstcentral axis, and the second shaft extends along a second central axis;a linkage unit comprising a first driving shaft and a second drivingshaft, wherein the first driving shaft is pivotally connected to thestationary shell on a first rotating axis and has a first sliding grooveand a first arc groove, and the second driving shaft is pivotallyconnected to the fixed shell on a second rotating axis and has a secondsliding groove and a second arc groove; a first operating mechanismcomprising: a first wing rod pivotally connecting to the stationaryshell on a first pivoting axis and pivotally connecting to the firstdriving shaft, and having a first supporting surface and a firstprotruding end being slidably disposed in the first arc groove; a firstlifting plate being fixed to the first wing rod and having a firstlifting surface substantially contacting with the first supportingsurface in parallel; and a first connecting rod being fixed to the firstshaft and pivotally connecting to the first driving shaft, and having afirst rod end being slidably disposed in the first sliding groove; asecond operating mechanism comprising: a second wing rod pivotallyconnecting to the stationary shell on a second pivoting axis andpivotally connecting to the second driving shaft, and having a secondsupporting surface and a second protruding end being slidably disposedin the second arc groove; a second lifting plate being fixed to thesecond wing rod and having a second lifting surface substantiallycontacting with the second supporting surface in parallel; and a secondconnecting rod being fixed to the second shaft and pivotally connectingto the second driving shaft, and having a second rod end being slidablydisposed in the second sliding groove; a first panel body being disposedon one side of the stationary shell and linking up with the firstdriving shaft; a second panel body being disposed on another side of thestationary shell and linking up with the second driving shaft; and aflexible screen being disposed on the first panel body and second panelbody and defining a flexible section, wherein the flexible screenincludes a supporting plate connecting with the first panel plate andthe second panel plate, and a multi-layer structure being disposed onthe supporting plate, and wherein the supporting plate has a weakeningstructure corresponding to the flexible section; wherein the first panelbody and the second panel body are transformed between an unfoldedstatus and a folded status; and wherein when the first panel body andthe second panel body are in the unfolded status, the flexible screen isflattened, and the first wing rod, the first lifting plate, the secondwing rod, the second lifting plate and the stationary shell collectivelysupport the flexible section; and when the first panel body and thesecond panel body are in the folded status, the weakening structureallows the flexible screen to bend at the flexible section, and thefirst wing rod, the first lifting plate, the second wing rod, the secondlifting plate and the stationary shell collectively define a yieldingspace for accommodating the flexible section.
 2. The foldable electronicdevice as claimed in claim 1, wherein when the first panel body and thesecond panel body are transformed from the unfolded status to the foldedstatus, the first panel body drives the first driving shaft to rotateabout the first rotating axis, the second panel body drives the seconddriving shaft rotate about the second rotating axis, the firstprotruding end and the second protruding end slide in the first arcgroove and the second arc groove respectively, the first rod end and thesecond rod end slide in the first sliding groove and the second slidinggroove respectively, the first connecting rod and the second connectingrod correspondingly rotate about the first central axis and the secondcentral axis respectively, and the first wing rod and the second wingrod correspondingly rotate about the first pivoting axis and the secondpivoting axis respectively so as to drive the first lifting plate andthe second lifting plate respectively to rotate with respect to thestationary shell.
 3. The foldable electronic device as claimed in claim2, wherein the flexible section further has a first deformation area, asecond deformation area and a third deformation area disposed betweenthe first deformation area and the second deformation area, and whereinthe first deformation area corresponds to the first panel body, thesecond deformation area corresponds to the second panel body, and thethird deformation area corresponds to the central body.
 4. The foldableelectronic device as claimed in claim 3, wherein the weakening structurefurther has a plurality of first groove groups and a plurality of secondgroove groups respectively extending along a first longitudinaldirection and alternately arranged with each other in a mainlongitudinal direction, wherein the first longitudinal direction isparallel to the first central axis and the second central axis, andperpendicular to the main longitudinal direction, and wherein theweakening structure is bent in the main longitudinal direction when thefirst panel body and the second panel body are transformed from theunfolded status to the folded status.
 5. The foldable electronic deviceas claimed in claim 4, wherein each of the first groove groups has aplurality of first groove portions sequentially arranged along the firstlongitudinal direction, and each of the second groove groups has aplurality of second groove portions sequentially arranged along thefirst longitudinal direction, and wherein the first groove portion andthe second groove portion, which are adjacent, are staggered from eachother.
 6. The foldable electronic device as claimed in claim 5, whereineach of the first groove portions has a first groove, and each of thesecond groove portions has a second groove, and wherein the first grooveand the second groove penetrate through the supporting platerespectively.
 7. The foldable electronic device as claimed in claim 6,wherein the first deformation area, the second deformation area and thethird deformation area are continuously arranged.
 8. The foldableelectronic device as claimed in claim 7, wherein when the first panelbody and the second panel body are in the unfolded status, the firstlifting surface and the second lifting surface are substantiallycoplanar; and wherein when the first panel body and the second panelbody are in the folded status, the first lifting surface and the secondlifting surface are substantially spaced apart and in parallel.
 9. Thefoldable electronic device as claimed in claim 8, wherein the firstcentral axis, the second central axis, the first rotating axis, thesecond rotating axis, the first pivoting axis, and the second pivotingaxis are not overlapping.
 10. The foldable electronic device as claimedin claim 9, wherein the first driving shaft further has a first mainbody and a first protruding part, the first main body extends along themain longitudinal direction, the first protruding part is disposed onthe first main body, the first arc groove extends from the first mainbody to the first protruding part, and the first sliding groove isformed on the first main body, and wherein the second driving shaftfurther has a second main body and a second protruding part, the secondmain body extends along the main longitudinal direction, the secondprotruding part is disposed on the second main body, the second arcgroove extends from the second main body to the second protruding part,and the second sliding groove is formed on the second main body.
 11. Thefoldable electronic device as claimed in claim 10, wherein the mainlongitudinal direction is perpendicular to the first central axis andthe second central axis, wherein the first driving shaft further has afirst embedding slot formed on the first main body and communicated withthe first sliding groove, and the first connecting rod further has afirst rod body connected with the first rod end and accommodated in thefirst embedding slot, and wherein the second driving shaft further has asecond embedding slot formed on the second main body and communicatedwith the second sliding groove, and the second connecting rod furtherhas a second rod body connected with the second rod end and accommodatedin the second embedding slot.
 12. The foldable electronic device asclaimed in claim 11, wherein the first driving shaft is pivotallyconnected with the first connecting rod on a first connecting axis, andpivotally connected with the first wing rod on a first subordinateconnecting axis, and wherein the second driving shaft is pivotallyconnected with the second connecting rod on a second connecting axis,and pivotally connected with the second wing rod on a second subordinateconnecting axis.
 13. The foldable electronic device as claimed in claim12, wherein the first panel body comprises a first outer surface distantfrom the flexible screen, and the second panel body comprises a secondouter surface distant from the flexible screen, wherein when the firstpanel body and the second panel body are in the unfolded status, aperpendicular line segment between the first subordinate connecting axisand the first pivoting axis is more distant from the first outer surfacethan a perpendicular line segment between the first connecting axis andthe first central axis, and a perpendicular line segment between thesecond subordinate connecting axis and the second pivoting axis is moredistant from the second outer surface than a perpendicular line segmentbetween the second connecting axis and the second central axis; andwherein when the first panel body and the second panel body are in thefolded status, the perpendicular line segment between the firstsubordinate connecting axis and the first pivoting axis is more adjacentto the first outer surface than the perpendicular line segment betweenthe first connecting axis and the first central axis, and theperpendicular line segment between the second subordinate connectingaxis and the second pivoting axis is more adjacent to the second outersurface than the perpendicular line segment between the secondconnecting axis and the second central axis.
 14. The foldable electronicdevice as claimed in claim 13, wherein the first panel body furthercomprises a first side shell and a first support block and is disposedon one side of the stationary shell to be operatively linked with thefirst driving shaft, the first support block is disposed in the firstside shell, and the first lifting plate is disposed between the firstsupport block and the stationary shell to operate in the first sideshell correspondingly, and wherein the second panel body furthercomprises a second side shell and a second support block and is disposedon the other side of the stationary shell to be operatively linked withthe second driving shaft, the second support block is disposed in thesecond side shell, and the second lifting plate is disposed between thesecond support block and the stationary shell to operate in the secondside shell correspondingly.
 15. The foldable electronic device asclaimed in claim 14, wherein the first panel body further comprises afirst covering plate and a plurality of first inserting columns beingformed on the first covering plate with intervals and passing throughthe flexible screen and the first support block to be fixed to the firstside shell, wherein the second panel body further comprises a secondcovering plate and a plurality of second inserting columns being formedon the second covering plate with intervals and passing through theflexible screen and the second support block to be fixed to the secondside shell, and wherein the first covering plate, the first side shell,the second covering plate and the second side shell hold the flexiblescreen collectively.
 16. The foldable electronic device as claimed inclaim 1, further comprising: a first positioning module comprising: afirst driving cam being fixed to the first shaft, and having a firstmain-tooth; a first driven cam slidably sleeved on the first shaft alongthe first central axis and having a first tooth space, a second toothspace and a first sub-tooth, the first sub-tooth located between thefirst tooth space and the second tooth space; and a first elasticelement disposed between the first driven cam and a fixed plate of thestationary shell; wherein when the first panel body and the second panelbody are in the unfolded status, the first main-tooth is located in thefirst tooth space; when the first panel body and the second panel bodyare in a half-folded status, the first main-tooth abuts against thefirst sub-tooth so that the first elastic element is compressed; andwhen the first panel body and the second panel body are in the foldedstatus, the first main-tooth moves into the second tooth space, and thefirst elastic element is released.
 17. The foldable electronic device asclaimed in claim 16, further comprising: a second positioning modulecomprising: a second driving cam being fixed to the second shaft, andhaving a second main-tooth; a second driven cam slidably sleeved on thesecond shaft along the second central axis and having a third toothspace, a fourth tooth space and a second sub-tooth, the second sub-toothlocated between the third tooth space and the fourth tooth space; and asecond elastic element disposed between the second driven cam and thefixed plate of the stationary shell; wherein when the first panel bodyand the second panel body are in the unfolded status, the secondmain-tooth is located in the third tooth space; when the first panelbody and the second panel body are in the half-folded status, the secondmain-tooth abuts against the second sub-tooth so that the first elasticelement and the second elastic element are compressed; and when thefirst panel body and the second panel body are in the folded status, thesecond main-tooth moves into the fourth tooth space, and the secondelastic element is released.
 18. The foldable electronic device asclaimed in claim 17, further comprising a synchronous module, which hasa first gear and a second gear, wherein the first gear is sleeved on thefirst shaft, the second gear is sleeved on the second shaft, and thefirst gear and the second gear are engaged with each other; and whereinwhen the first shaft rotates about the first central axis or the secondshaft rotates about the second central axis, the first gear or thesecond gear rotates correspondingly and drives the second gear or thefirst gear to rotate so that the second shaft or the first shaft rotatessynchronously with the second gear or the first gear correspondingly.19. The foldable electronic device as claimed in claim 18, wherein thefirst shaft, the second shaft, the linkage unit, the first wing rod, thefirst connecting rod, the second wing rod, the second connecting rod,the first positioning module, the second positioning module and thesynchronous module are duplicated and disposed on two sides of thestationary shell respectively and correspondingly.